Job growth for medical office managers in the U.S. is expected to grow 22 percent between 2010 and 2020 to meet the increasing demand of the country's aging population [source: CareerCast]. And while medical records technicians are considered to have one of the least stressful jobs in healthcare administration, those working in most other hospital administrative jobs report high rates of work-related burnout [source: Chou et al.]. Medical billing managers, for instance, work with providers, patients and insurers; they also submit claims and bill patients.

This becomes a complex and stressful job for a couple of reasons. It's entirely likely that you've had a moment of frustration or confusion when dealing with your own medical insurance. So consider that a medical billing specialist deals with the ins and outs of insurance companies and their coverage policies day-in and day-out.

If that doesn't sound terribly stressful, add into the equation the fact that they also handle collecting on unpaid bills. Additionally, they review and appeal billing errors, claims-processing errors and denied claims. And they sort through all this paperwork and red tape while dealing with emotionally upset and possibly hostile patients and their relatives.